Locking-socket for electric lamps.



T. DEAD'ERICK. LOCKINQSOCKET FOR ELECTRIC LAMPS.

APPLICATION FILED JULY 15, I913.

1,1 74 233. Patented Mar. 7,1916. I

Fag Z wi/ mmeo z jwaiwa nto e ,"rnomasnnannmox,;.or nAsH viLLn,Tennessee.

To. all. whom it may concern Be 'it -ln1ownthat 1 THOMAS DEADERICK, acitizen of the'United States of Amerlca,

residing in the city of Nashville, in the suitable switch mechanism.

proved Locking-Socket for Electric Lamps,

county of Davidson, .inthe Statepf Tennesseqhave invented. a certain.newand Imof which the following is a "specification.

Myinventionrelates to incandescent electric 1 amp sockets in whichprovision is made for automatically locking the lamp Won its insertioninto the socket, and thereby? prevent the'unautholized removal of thelamp, while permitting the proper personwith av spe cial form of key' torelease and rem ove the lamp when desired. i a

The object of-my invention is 'to provide a simple and inexpensivedevice of this character, and one which will .requirethe' least possiblemodification of the standard form of lamp socket. This object I attainby the constructionwhichl will now describe.

In the accompanying drawings, Figure 1 is an enlarged. view, partly insection, of an incandescent electric lamp socket "provided with myimprovement; Fig. 2 is a detached outside view of the screw shell of thesocket. Fig. 3 is a transverse section through the same looking in thedirection of the toothed locking cam; Fig. L shows in perspective thelocking cam, its spring and the retaining ring, detached.

. In these draw1ngs,'I0 indicates the ord1-'-- nary insulating body ofporcelain or the like, which carries the lamp and wire terminals, andwhich may or may not contain One of the wire terminals is indicated at11,Fig. 1,-while the. central lamp terminalis indicated at 12 andtheouter lamp terminal is a screw shell 13, adapted to receive and holdthe usual threaded base 14 of the incandescent electric lamp 15. Thewhole is to be in'closed as usual in av metal casing, consisting of ashell 16' and cap 17, both with insulating linings,

the shell so that: its toothed face is in a position tocont-act with thebottom rim'of-the threaded base of the lamp when the latter is screwedinto the socket,-as shown in F g. 1.

' liocxine-soo inr non nLnc'rnIc-"LAMPs.

I Specification of Letters Patent.

Application filed July 15,1913. Serial No.779,175.

Fig. 3, to securetlie sorew shell 13% 24 which may be of any suitableform, but

rim of the lamp base and prcvcntthc'lamp indicated in 1, and the shell16 ofthc, socket is promded with atubularguide 26 The camspindle isinserted intothe bearing 20 from within-. the shell sand is j retainecinits bearingby the off-set portion22 -of e I the ring 21, whichreceives the' scren insulating body 10. (A suitable light spring ispreferably a .co'iledspring, such as shown in Fig. 4, is provided toactupon thevoam; plate 18 in such fashion-as totendto keep the cam plateturned on its spindleto. the.

positionshownlll-Flg- 3-; lVlien ;therefore, I, 1 alamp is screwed down.nto thesocket, the rlmof thelamp basc w ll COlllLflCi/flVlilll the. l

toothed edge of the, cam plate andpuslrits;

proje'ctingend backward,.butgon attempting to unscrew the lamp out ofthe socket again. I a

the teeth of the cam plate ,wlfill, biieintdthe '75 i from beingunscrewed, unless the person has the means to 'free the cam from thelamp base. For this last purpose the outer end of the cam plate spindleis made iiolygonal, as for example, 't'hree-sidedl'as seen, in Fig. 2,and a key 25 is ln'ovidcd with a corresponding opening in its end to fitover the polygonal end-"of the spindle. The handle of the key ismade' ofinsnl'ating material, as

for the key, lined with insulating material and of suflicient length toprevent access to the cam spindle by any other device than a key)rovidedfor the punppse.

On applying the kcy to the spindle 19, and then turning; the key againstthe tension of thespring 24. the cam will beturned sufficicntlv to freeit teeth from engagement with the end of the lamp base, so that then thelamp may be unscrewed and removed from the socket.

I claim as my invention,

1. An electric lamp sockct l1a\'-ing an insulating bodyfca'rryingwirca'n'd lamp tcrloo minals, one of the latter being a scrcw'shcll.with a locking cam pivoted in the screw shell toc'ontact with the and ofthe base to be inserted in the screw shell. said loclcin; cam hai'ingmeans adaptdd to be actuated by I05 a key.

2. An electric lamp socket. having an insi'ilatin'g body carrying wireand lamp torminals. One of the latter being a screw shell. with alocking cam pivoted in the screw shell to contact with the end of thebasc'to be inserted in the screw shell,a spring to act.

* npon tlie; am, and liey to move it against.

ithe sprmg..-

I 3.- An electric lamp socket, having an ingsnlatin'gkbody'. carryingwire and lamp ter-' -minals, one ofthe latter being a screw shell,-.-'a.-'locking {cam within the shell adapted to contact with the baseto, be. inserted in the 'lscr'ew shell andhaving ais 'ndle turning in fabearingin' the shell, said spindle being a-.

ada ted-m receive and beactuated by a key i nserted -at theside of thelampsocket.

' v4.;An.;'electri'c lamp Socket, having an in,

j snla't iji'gfio'dy, carrying wire. and lamp terminals, one of thelatter being a screw shell,

with alockin ,cam having aspindle in a 1? bearing in sai' shel1,th'e endof the spindle iggprojectlng outwardly and adapted to be acandmovablymountedi -tlierein to conwith a, locking :cam movably. mountedWith- I and having means'adapted beactuated by tuated by a 'ky, means-tohold the i v it'sbfearingand a spring to -act'on the cam, substantiallyas described.

. '6. An electric lamp socket having an sulating body carrying Wireand-lamp1-ter minals,'on'e" of the latter being a screwzgshell withalocking cam. within the screw s With the end of. the base to be insertedand having means. adaptedj'to be actuated by; a

t havingan i'nf. and lamp tereingl ascrew shell,

sulating body carryin" minals, zone of the latter in the screw shell andhav ng teethto 'contact with the end of the base-t0 be inserted a key.

a v, a I 45.- III-lFGStlmOIIY whereof I have signed my name to thisspecification, in the .presence of two'subscribing, Witnesses.

*Witness'es-g 1 S. V. DE DERICK, .T. L. fDILL RD.

1 THOMASDEADERICKY:

